Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b39695a3adffce8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 14:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baccb95a059fb4df8a86f63c67322011 SHA-1: 518bad9248f262bba6b2ff86332ae15cdebff83d SHA-256: 7b39695a3adffce8f0348b60fd7c11ad1511704bb7898a2a3175a1b1be263846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the execution of JavaScript to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=language+test+construction+and+evaluation+pdf PDF link annotation
    • http://hysansam.com/fckeditor/userfiles/image/detorogifuk.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090baa54f5e6---kulefadupapegoj.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ee1b5c412f395a93ca2dae3cdede7f1/95109412805.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160745ae1176d4---xosasigilibepokatokejelen.pdfIn PDF document text
    • https://thehouseproduction.net/file/pamudupi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/71839785120.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/21114105762.pdfIn PDF document text
    • https://12shio3.com/contents//files/babuzamojumo.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/girudizutirerijo.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/36281238595.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/ragujexomemuga.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/somiwanimuzeduvufetil.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qfum7330mc9mliqvb6ldmvip30/kakuzugigulomela.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/luxukumodozagezek.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/zixefapunexoleselul.pdfIn PDF document text
    • http://proxima-design.cz/files/file/33580849901.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/15259664994.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67994938547.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2e1831a35---fuzokosudoxusudigi.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zumubelufarofofatow.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3652d135---lolasesonivagibeb.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/tifuk.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/kaxuwu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beda37a70---95954490097.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/88681548594.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 10916 bytes
SHA-256: dbefdad112d92f3b990de4472470d77187277926ec3421d78459fb0caa711cb8
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 18296 bytes
SHA-256: 7394f414c629ad4c50640be26b9da148ef019ceaa3b8d65f2ff6e9c5ad46cd66

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